/*
 * Copyright (c) 1996, 2003, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package com.sun.corba.se.impl.naming.cosnaming;

import org.omg.CosNaming.NameComponent;

/**
 * Class InternalBindingKey implements the necessary wrapper code
 * around the org.omg.CosNaming::NameComponent class to implement the proper
 * equals() method and the hashCode() method for use in a hash table.
 * It computes the hashCode once and stores it, and also precomputes
 * the lengths of the id and kind strings for faster comparison.
 */
public class InternalBindingKey {

  // A key contains a name
  public NameComponent name;
  private int idLen;
  private int kindLen;
  private int hashVal;

  // Default Constructor
  public InternalBindingKey() {
  }

  // Normal constructor
  public InternalBindingKey(NameComponent n) {
    idLen = 0;
    kindLen = 0;
    setup(n);
  }

  // Setup the object
  protected void setup(NameComponent n) {
    this.name = n;
    // Precompute lengths and values since they will not change
    if (this.name.id != null) {
      idLen = this.name.id.length();
    }
    if (this.name.kind != null) {
      kindLen = this.name.kind.length();
    }
    hashVal = 0;
    if (idLen > 0) {
      hashVal += this.name.id.hashCode();
    }
    if (kindLen > 0) {
      hashVal += this.name.kind.hashCode();
    }
  }

  // Compare the keys by comparing name's id and kind
  public boolean equals(java.lang.Object o) {
    if (o == null) {
      return false;
    }
    if (o instanceof InternalBindingKey) {
      InternalBindingKey that = (InternalBindingKey) o;
      // Both lengths must match
      if (this.idLen != that.idLen || this.kindLen != that.kindLen) {
        return false;
      }
      // If id is set is must be equal
      if (this.idLen > 0 && this.name.id.equals(that.name.id) == false) {
        return false;
      }
      // If kind is set it must be equal
      if (this.kindLen > 0 && this.name.kind.equals(that.name.kind) == false) {
        return false;
      }
      // Must be the same
      return true;
    } else {
      return false;
    }
  }

  // Return precomputed value
  public int hashCode() {
    return this.hashVal;
  }
}
